Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a879e77c7e52db4…

MALICIOUS

PDF

87.5 KB Created: 2021-08-11 16:33:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: daf89e58f4e59099aae1bd6acb8bdf9f SHA-1: 67bdd431ad0120250889c7d228a7e81bb530175b SHA-256: 3a879e77c7e52db436c81163aeed78637194017618d3c5d0c5b2acd77696e8fa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm, likely intended to lure users to malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent, with the sample being flagged as Pdf.Phishing.Trojan. The presence of embedded URLs and the nature of the link farm suggest a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://laborke.ru/uplcv?utm_term=bahubali+1+full+movie+in+tamil+free+download+tamilrockers PDF link annotation
    • http://uniroll.pl/user_images/file/94030131890.pdfIn PDF document text
    • https://www.nstoplana.rs/ckfinder/userfiles/files/24916809432.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3569c1bab---74939405844.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160710c8a71588---zuwuw.pdfIn PDF document text
    • http://accronline.com/userfiles/file/nimex.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/wajukapixunoxujoxonozu.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/9c3a6c24a87735aaec985803ea25574f/7814615481.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/99493692492.pdfIn PDF document text
    • http://gfb.it/upload/fck/file/5772664175.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/93293495828.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/tupexametimopa.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/1791521659.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/mhrt2dp94voq2jcu1i8nmrpnjf/bizomajotidewapok.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/27493090433.pdfIn PDF document text
    • http://ldbell1965.net/clients/85689/File/37509502571.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/3781531cd7c6bf87ebf5cf3c5fe54a61/tidajarezalemevivunozeg.pdfIn PDF document text
    • https://cristalensi.com/public/File/98757770622.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ae34bbd7e---48225740731.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610893f85f0ae---61146215466.pdfIn PDF document text
    • http://gtshotel.it/images/file/2845033846.pdfIn PDF document text
    • https://okna-stv.ru/userfiles/files/nimapota.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF157 16920 bytes
SHA-256: e38081e4a5a2d3524813d9ee211ee83d2bbcd021cc70b0367a7ad4e52d1efdbb
font_01_sfnt_off00011d60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D60 11328 bytes
SHA-256: b07fd75386ace0c57e75ee982bf6bf87bc74c88bf344a37191343c784b2b3ff5
font_02_sfnt_off000137f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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